Write Anywhere File Layout - Wikipedia
The Write Anywhere File Layout (WAFL) is a proprietary file system that supports large, high-performance RAID arrays, quick restarts without lengthy consistency checks in the event of a crash or power failure, and growing the filesystems size quickly. It was designed by NetApp for use in its storage appliances like NetApp FAS, AFF, Cloud Volumes ONTAP and ONTAP Select. Its author claims that WAFL
LKML: Daniel Phillips: ddsnap: Starting down the long road to the land of optimal
Hi all, Network storage these days entails not only storing files and serving them via NFS or Samba, but maintaining continuous live backups, user accessible volume snapshots and remote replicas. The ddsnap snapshotting, replicating block device is the secret sauce of the Zumastor open source NAS project that does these things, and as far as we know, is the only way to do these things on Linux. ht
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https://liw.fi/larch/ohad-btrees-shadowing-clones.pdf
https://www.semanticscholar.org/paper/Improving-block-sharing-in-the-Write-Anywhere-File-Grusecki/3d1abb7432c9e52758f1bccc5b1e2e60dfbfe91f?p2df
https://www.storageconference.us/2015/Papers/09.Dragga.pdf
Versioned pointers: a new method of representing snapshots [LWN.net]
